Audiofight

Alright.

Quick question for guys with e-fans.

Does your rpm at idle drop by any noticable amount when the e-fan kicks on?

Isn't the BAC supposed to compensate for this or is it too much for it to handle? I thought the BAC compensated for added draw on the engine, such as AC.

Is there something I forgot to do when I installed my e-fan in order to get the engine to compensate from the extra electical draw?

Basically, my car will idle at 900-1000 rpm when the fan is off and then drop down to 700-750 rpm when the fan is on.

I tried adjusting the idle while the fan was off and got it set at 750, but when the fan kicks on, the idle drops to like 500-550 rpm and sometimes stalls.

swoop

BAC is controlled by the ECU. The ECU doesn't know that you have an e-fan nor when it cuts on or off. So it doesnt compensate for the fan.

Scott 89t2

but the ecu knows when the engine is idling lower then it should be....

bac should kick in raise it. it might be a bit lower but not by 250.

NZConvertible

Scott's right, the ECU should be compensating for higher alternator loads. Is the BAC valve actually working? Is it dirty?

Audiofight

Well. Here's the deal, I think my ECU needs resoldering....I have done everything I can to figure out why my car is flooding. I have serviced the injectors, new plugs and 8mm wires. Adjusted the TPS and idle screw. I have also replaced 99% of the vacuum lines.

I unhooked the BAC while it was running and the engine rpm lowered by about 100 rpm. With the car off, hooking two jumper wires up, I was able to get it to click.

I have a spare BAC (also testing good) laying around from my parts car. I will give a good cleaning and swap them next Tuesday (part is at my dad's shop, gotta go home to get it).

I was just wondering whether the ECU or BAC would know when the e-fan kicks on. I guess I was right, now to figure out why it isn't compensating enough.

I am not looking for a perfect, always at 750 idle here. I don't mind if the idle drops 50-100 rpm, that is acceptable. But 250 rpm seems too much of a window....

skydivr73

Well, I have to ask what the concern is? Think about it--the idle is SUPPOSED to be around 800 and yours is at 750 under load...no problem there. And being around 900-1000 without the load is not bad either. I have heard all kinds of horror stories about very high or very low idles and yours seems to be right in a good spot.

Aside from that, I might say to go for the FD alternator that Silverrotor sells. It can handle more of a load than the stock one that you have and you just might see better results with it. Besides, it is a good upgrade all around. I am going to drop one in mine pretty soon too.